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F.25 Promotor
Role Civil utility aircraft
Manufacturer Fokker
First flight 1946
Number built 20

The Fokker F.25 Promotor, first flown in 1946, was a single-engined, twin-boomed, four-passenger monoplane with a pusher engine mounted at the rear of a central nacelle. It was of wooden construction and has fitted with a retractable nosewheel undercarriage. One feature of the design was that instead of a 2 + 2 seating, the pilot sat in front to the left, and all three passengers were on a bench seat to the rear of him. Alternatively, when being used as an air ambulance aircraft, it could carry a patient on a stretcher, which was loaded through a hatch in the aircraft's nose.[1] The F.25 was evocative of the pre-war G.I design.[2] The F.25 was based upon the design of the Difoga 421 aircraft, home-built and -designed secretly during World War II by Frits Diepen, a Ford garage owner from Tilburg, the Netherlands. His intention was to escape from German-occupied Europe to Britain using this aircraft that was powered by a Ford V-8.

Although 20 F.25 aircraft were constructed, sales were disappointing for the same reason that thwarted the sales prospects of so many American post-war designs. A newly built aircraft could not compete in cost with the thousands of surplus aircraft on the market in the years following the war.

Specifications (Fokker F25)[edit | edit source]

Data from Promotor In The Air[3]

General characteristics

  • Crew: 1
  • Capacity: 3 passengers
  • Length: 8.53 m (28 ft 0 in)
  • Wingspan: 12.00 m (39 ft 4 in)
  • Height: 2.97 m (9 ft 9 in)
  • Wing area: 18.0 m² (193 ft²)
  • Empty weight: 961 kg (2,115 lb)
  • Max. takeoff weight: 1,427 kg (3,140 lb)
  • Powerplant: 1 × Lycoming O-435-A, 142 kW (190 hp)

Performance

  • Maximum speed: 227 km/h (123 knots, 141 mph)
  • Cruise speed: 185 km/h (100 knots, 115 mph)
  • Stall speed: 85 km/h (46 knots, 53 mph)
  • Range: 950 km (513 nmi, 590 mi)
  • Service ceiling: 3,400 m (11,150 ft)
  • Climb to 1,000 m (3,300 ft): 6.2 min

References[edit | edit source]

  1. Smith Flight 5 August 1948, pp. 143–144.
  2. Flight 3 October 1946, p. 359.
  3. Smith Flight 5 August 1948, p. 145.

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